Are the Gospels based on Eyewitness Accounts?

The four gospel accounts of Jesus’ earthly ministry (Matthew, Mark, Luke, John) have been under attack for a long time. Usually we are told they are corrupted and unreliable stories, filled with myths, mistakes and misinformation. But is that true? Is there any evidence to suggest they are reliable accounts that accurately record real events in real places?

In this video, Dr Peter Williams (Warden of Tyndale House, Cambridge) surveys a few lines of evidence that suggest the Gospels are not historical/religious fiction.